Broom machine



Oct. 14, 1941, E. MccAFFRAY ErAL 2,2585936 BROOM MACHINE Filed Nov. 14,1939 2 Sheets-Sheet 1 j l www" 4 1 fig( a a uw. wf

" oct. 14, 1941. E MCCAFFRAY ETAL 2,258,936

BRooM MACHINE Filed NOV. 14, 1.939 2 Sheets-Sheet'2 y ,aff

E 'sa a A 60 7k Patented Oct. 14, 1941 BROOM MACHINE Edmund McCaffray,Baltimore, and Charles E. Oyler, Halethorpe, Md., assignors to EdmundMcCaffray and B. M. McCaffray, trading as The Baltimore Broom MachineCompany,

Baltimore, Md.

Application November 14, 1939, serial No. 304,400

1 Claim.V

This invention relates to broom sewing machines or the like, and moreparticularly to a device of this character which is provided with a workcarrier adapted to receive a broom at an initial idle position and to beshifted to an operative position in proximity to the sewing apparatus.The general object of the invention is to provide a novel and improveddevice for facilitating the shifting of the work carrier.

In machines widely in use at the present time, the main frame of theapparatus encloses a space within which the broom to be sewed is adaptedto move, and suitable stitching mechanism is provided upon either sideof this space to bind the broom straw firmly together as the broom isfed past this mechanism by a gradual movement of the carrier. Thecarrier in such a machine is pivotally mounted upon a lower orintermediate portion of the main frame and includes a vise for firmlyclamping the partly completed broom during the sewing operation. In itsinitial idle position the vise projects outwardly from the generalconnues of the main frame and clear of the needles, loopers, and

other parts of the stitching mechanism; and after the broom is clampedin the vise, the carrier is grasped by hand at any convenient portionthereof and shoved by main force into position between the stitchingdevices for effecting the sewing operation.

In these machines, means are usually provided for starting the poweroperated sewing mechanism automatically upon throwing in the vise, andat the same time initiating the gradual feed of the carrier outwardlyduring the sewing operation. Means are also generally provided forautomatically springing the jaws of the vise open at the end of theoutward feed of the carrier after the stitching has been completed.

VThe present invention contemplates the provision of foot operated meansfor throwing in the work carrier or vise; and in its preferredembodiment a foot lever is culcrumed upon a stationary part of the mainframe, preferably at a point below the horizontal pivot of the carrier,and is operatively connected with the carrier or of its trunnions bymeans of a chain and grooved pulley segment, whereby upon apr plyingpressure to the lever, the carrier frame vise will be rocked intostarting position.

therv objects and features of novelty will be apparent from thefollowing specification when read in connection with the accompanyingdrawings in which certain embodiments of my invention are illustratedbyway of example.

In the drawings; Figure 1 is a fragmentary view in side elevation of abroom sewing ymachine embodying the -principles of the invention,showing a portion of the main frame and stitching mechanism and thebroom carrier pivotally vmounted thereon.

Figure 2 is a fragmentary view in front eleva-` tion of the upperportion of' the work carrier;

Figure 3 is a fragmentary View, partly in vertical section and partly inside elevation, as seen from the opposite side from that of Figure 1;

Figure 4 is a fragmentary sectional View of4 a detail of the automaticfeedingmechanism'shown in Figure 3; and k Figure 5 isa fragmentary Viewin front elevation of the lower portion of the machine'.

Inl the drawings, wherein isv more or` less diagrammatically illustrateda l-broom sewing machine incorporating the novel throw-inV mechanismforming the subject ofthe present invention, the main frame vof themachine is desighated generally by thereference numeral i9, as best seenin Figures 1 and 5. Projecting from the front of the main frame lil-area pair'of brackets ll which are provided withbearings i2 within whichare adapted to rotate v the trunnion shafts i3 and ld which serve topivotally support the work carrierdesignated generally by the numeralIS-with respect tothe frame. Both of the trunnion shafts I3 and I4 varerigidly received within the cylindrical bosses Il and I8 of the frame ofthe work carrierv l5.

The work carrier l5 comprises essentially the vise jaws 2B and ,2lbetween which a broom is adapted to be gripped forystitching. Thecarrier assembly also includes numerous other elements pertaining to theoperation of the jaws, the vertical adjustment of thek work, and,certainv other mechanism, only a portion of `,which is necessary to anunderstanding of the present invention. and thus only such portions willbe described in the present specification.

Before entering into a description of the mechanism comprised in thecarrier, the general movements of the Carlier lwill be explained. Thecarrier is shown in full lines in Figures 1 and l3 of the drawings in anintermediate position in which the sewing operation has progressed abouthalf way. Secured to the main frame IB as by means of a bracket23 isaportion of the sewing mechanism indicatedf diagrammatically at 25. Acorresponding oppositely disposed sewing device 25 is shown in Figure 3,and it is obvious that the carrier with a broom clamped in its vise isadapted to move between the sewing mechanisms 25 and 25 during theoperation of the machine. Each of the sewing assemblies are ofconventional construction and may include thread loopers 26 and 2'6,through which hooked needles (not shown) are adapted to move in order totransfer the thread through the broom from one side to the other to formthe binding stitches.

The initial idle position of the carrier I5 in which it projectsoutwardly of the sewing mechanism, in readiness to receive a broom, isindicated by dotted lines and is designated by the reference characterA. The center line of the mechanism, While in this position, is shown ata. and of course passes through the axis of the trunnion shafts I3 andI4. The position in which the carrier is disposed when it is thrown into start the sewing operation is indicated by the broken lines at B, andthe center line of the device when in this position is shown at b. Theintermediate position shown in solid lines may be convenientlydesignated C.

The movement of the carrier from the position designated B to position Ais effected gradually or in a step-by-step manner while the broom isbeing sewed, and the throwing in of the device from position A toposition B is effected by novel means which will now be described.Rigidly secured to one of the trunnionsthe one designated 4 in theembodiment shown in Figure 5-is a sleeve 28 which carries -a pulleysegment 38, the segment being grooved as at 3| and having secured at oneend thereof as at 32 a chain or other flexible arrangement 33. The upperportion of the chain 33 lies in the groove 3| and its lower end issecured to a link 34 pivotally connected to a foot lever or pedal 35, asat 38. The

pedal 35 is pivotally mounted as at 31 to a bracket 38 secured to thelower portion of the main frame l0. It will be readily perceived thatupon depressing the pedal 35 the segment 3U will be rocked about theaxis of the trunnions in a clockwise direction as viewed in Figure 1.This of course will rock the entire work carrier l5, together with allof its associated mechanism, from position A to position B forinitiating the operation of the machine.

From the position indicated at B the carrier is moved during the sewingoperation outwardly of the main frame I back to position A. For purposesof concise illustration, a device of relatively simple construction forfeeding the carrier is shown and described herein, but it is understoodthat this exemplary embodiment does not represent the most modern andimproved construction, and furthermore that any desired practical typeof step-by-Step feeding mechanism may be employed in the presentinvention without departing from the scope thereof as defined by theappended claims. Suitably secured to the carrier as by means of abracket 40 is a bar 42, the remote end of which extends through adepending box-like portion of the main frame designated 43. Extending inparallel relation with the bar 42 and also passing through the box frame43 is the bar 45, the outer end 45 of which is normally spaced from theabutment 41 carried by the rod 48 which is adjustably secured as at 49to the upper portion of the bracket 40. The rod 48 is threaded throughthis bracket portion and is manipulated by the knob 5l) and secured inadjusted position as by means of the lock nut 5|.

Abell crank lever 54 is fulcrurned as at 55 to a downwardly projectinglug on the bar 42 and has its upper end pivotally connected as at 56 toa projection 5'| secured to the bar 45. The other end of the lever 54 isprovided with a roller 58 for contact with the rising and falling plate60, this plate 6|! being provided witha cam roller 6| for contactingwith an operating cam (not shown), by which it is verticallyreciprocated during the operation of the machine. The bell crank lever54 is biased in a clockwise direction as seen in Figure 3 by means ofthe spring element 62 secured at its respective ends to a pin 64 on thelever 54 .and a pin 65 on the bracket 4|).

The right hand end 46 of the bar 45 has a downwardly projecting portionthrough which a set screw 68 is threaded and adapted to be secured bymeans of the lock nut 69. The end of the set screw is adapted to abut aprojection 10 extending upwardly from the bar 42.

Within the box-like frame portion 43 there are pivoted, above therespective bars 42 and 45, the upper ends of the levers I2 and 15. Thelower portions of these levers carry rollers 11 and 'I8 which areadapted to be intermittently and alternately moved by cams rotated bythe main drive of the machine. Each of the bars 42 and l5 within the box43 is provided with a clamping jaw such as illustrated at 8|) in Figure4. The jaws 8|) are periodically clamped upon the respective bars 42 and45 by pressure of pins or bolts 82 carried by the cam levers 12 and 15.

During the operation of the machine, the bars 42 and 45 are alternatelyclamped and released. When the bar is released it is drawn by means ofthe spring 62 against the adjustable stop 4l. By adjusting the stop 4'|any desired amount of relative movement between the rods 42 and 45 maybe attained, and this regulation of the stepby-step movement of the feedwill determine the length of the stitches effected by the sewingmechanism during the movement of the work carrier therebetween. Next,when the rod 45 is clamped by the appropriate motion of its cam bar l5,and the bar 42 released by the opposite movement of its lever l2, thework carrier 5 is moved forwardly by means of the vertically oscillatingplate or rail 6!) which rocks the lever 54 through Contact with theroller 58. The adjustable stop 68, 'I0 prevents excessive movement ofthe vise during this forward step. This positive gradual step-by-stepfeed of the work carrier is cont-inued until the carrier reaches theinitial position A.

Upon completion of the sewing of a broom, it is removed from thecarrier, a new broom inserted, clamped in vise, and the carrier is againthrown into operative position by depression of the treadle 35.

As best seen in Figures 1 and 2 of the drawings, tlie jaws 2i) and 2|are clamped upon the work by means of the following mechanism. Pivotedas at 85 to a relatively stationary portion of the carrier I5, uponeither side thereof, are the levers 85. These levers are provided withinwardly turned end portions which are provided with openings throughwhich the horizontal bar 88 extends. At the ends of the levers 86 arepivotally connected the links 89 which are in turn pivotally secured tothe jaw 20 as at 90. At other points along the levers 85 upon theopposite side of the fulcrum 85 are pivoted the links 92, which are alsopivotally connected as at 93 with the jaw 2|. Through suitableconnections, including preferably a turnbuckle 95,

the rod 96, the offset link 38, and the bell crank 99, the levers 86 areconnected for operation to the bifurcated foot lever or treadle |00,which is pivoted on a stationary fulcrum supported by the main frame.The bell crank 99 is fulcrumed as at I0| between and to the arms of thelever |00 and has a downward extension |02 'which is pivotally connectedto one end of a horizontal lever |04 which is pivoted at an intermediatepoint |05 to a relatively stationary portion of the carrier I5. 'Iheforward end of the lever |04 pivotally carries as at |05 the lockinglever |08. This lever is biased in a counterclockwise direction by meansof the spring |09. The lever |08 is provided with a series of teeth |I0which are adapted to be engaged by a dog I|2 carried by the treadle |00.The lower end of the lever |08 is provided with the spring pressed dogII5 adapted under certain circumstances to abut the projection IIScarried by a bracket II'I secured to the lower part of the main frameI0. These connections are substantially the same as those shown in thepatent to Oyler and Parker 1,071,332 and reference to that patent ismade for further disclosure of the details of the machine not directlyconcerned with the present improvement.

The operation of the vise actuating means will be readily apparent. Inorder to clamp the jaws 20 and 2| upon a broom the treadle |00 isdepressed which, through the elements 99, 08, 06, S5, and 8B, will rockthe levers 05 in a clockwise direction as seen in Figure 2. Thismovement, through the links 89 and 02, will move the jaws 20 and 2|toward each other and clamp the broom. Arrangement is made for clampingbrooms of differing thicknesses, and thus the downward movement of thetreadle |00 will continue until the dog IIZ engages the proper tooth IIOon the lever |08, the spring |09 urging the lever |08 toward dogengaging position. After depressing the treadle |00 and properlyclamping the broom, the pedal 35 is actuated in order to throw theentire work carrier device I5 into operative position.

The vise jaws 20 and 2| are adapted to be automatically opened upon-completion of the sewing operation by the contact of the dog II5 withthe abutment I|6, whereupon vthe lever |08 is rocked in a clockwisedirection and the tooth I|0 is released from the dog I I2. A spring |20connected between a pin |2| on one of the vise jaws and a point |22 onthe foot lever |00 exerts a lifting force on the lever and, when thelatching lever |08 is released, the foot lever is raised and the vise isopened.

Various changes and modications may be made in the embodimentsillustrated and described herein without Ideparting from the scope ofthe invention as defined by the following claim.

Having thus described the invention, what is claimed as new and desiredto be secured by Letters Patent is:

In a broom sewing machine of the class described, in combination, a mainframe, sewing mechanism thereon, a. broom carrier frame provided withtrunnions supported in fixed bearings carried by said main frame forlimited swinging movement from an initial idle 4position for theinsertion of a broom to be sewed, to an operative position with respectto said sewing mechanism,from which latter position the 'carrier framemay be fed back to the initial position during the sewing operation,means for swinging said carrier frame from said initial idle position tosaid 0perative position comprising a pedal fulcrumed on said frame at apoint below the trunnion mounting of said carrier, a peripherallygrooved pulley segment xed upon one of the trunnions of said carrier, -achain secured to said segment, trained through said groove, andconnected with said pedal, whereby the depression of said pedal causesthe trunnion to rock and the carrier fr-ame to swing into operativeposition.

